Electrically-heated wax-pot for shoe-sewing machines.



EL N. CHANDLER L T. B. LEWIS. i BLEGTRIGALLY HBATED WAX POT Fon SHOE SEWING MACHINES.

APPLIUATION IILBD MAR.19,1909.

Patented Apr. 18, 1911.

`i'fleated Wax-Pols t'or rnnpww'riiing Fahr *tren errrrne ril-relier ernten.'

EDWIN' N. CHANELER.` OF BROCKTON, AND THEODORE B. LEVJIS, 0F CAMBRIDGE, MASSACHUSETTS, ASSIGITORS TO SIMPLEX. ELECTRIC HEATING GOMIAIFY, 0F BOSTON, MASSACHUSETTS, .A COREORATION O F IlIASSACHUSETTS.

ELECTRICALLY-HEATED WAX-.POT FR. SI'IOILSEWING MACHINES.

Application, filed March 19,

To all lwhom 'in' may (fonce/'n Be it', known that we, Enw1\Y N. Cninnmcu. a citizen of the United States, and resident' of Brockton, in the county ot' Plymouth und State oit' lvlaseaehueette. :ind lni-nom'un-; l5. Lewis, of Cambridge. in` the eounti' ol.' Mid diesen and State ot' Museaelnwette. have invent-ed an Improvement in lllertrivolti` ehinee, ot whieh the i'ollowinn' deseription. in connection with the aero-uipuuyiug drawings. is a specification. like lettere ou the drawinge reini'eeenting' likt` parts.

Our invention ie a wax pot lor fihoe inaehinee, and has 'lor its ohjeet the prevh-'iou o'tl means renderingl it` praetieahle to ijinphiy a small pot, small amount ot wax, aud mini mum eurrent.

In its preferred embodiment it eo;1si.'sls otl an electrically, heated veneel `wherein the heater surrounds the side "alle of the pot orl vessel, Which is provided with suitahle flanges or lugs for supporting the Saune lixedly With relation to means tor delivering' the thread into the wax within the pot and from the pot after it is waxed.

The pot contains .means for providing" a Slow, uniform admission ot fresh wax. for properly rep]eniehingr the Supply in the pot and automatically maintaining ay eutlieent amount; therein for lise, notwithstauding the relatively small Size of the Wesel. eo that the Wax is supplied approximati-dy as required bythe thread paesingt/hrougrh the pot. The metal portion of 'the pot is kept at a relatively7 high temperature by havinfY the heater applied directly te. and ae a part: of. the wall of the pot, the latter heine: pre'ler ably covered with an insulating easing or jacket, and the upper part or Supply po rtion oitt the pot is maintained at a relatively tow temperature by being heated indirectly, b5' conduction from the more highly heated lower portion of the pot.

A vfurther feature ofvour invention is oi peculiar value/,in eonneetion with a tl'irenfh' Waxing machine such as the ordinary (loodyear stitcher. ln a maehine of this kind it is important to seeure, first, 'means 'for quickly melting the wax in the morning' when it is desired to puty the machine in opl eration, and second, to prevent overheating the Wax and consequently injuring;r or rottinpr the thread and rendering the wax so thin Specification of Letters Patent.

'aiented Aipr. trl, 19H. 190s. senin no. tenias.

that: au iiniutlirient amount will rliufnr to the thread. We altain three Iwo apparently enullietiing' ohiertey hy eonetrueiiun' the heaters ol' apprortiuniti-ly l'our limes the heat, eapaeity required tor a iornnn workingV teluprinture, so that. in starting'. npgn'oxiinatfxl)v l'our times the urn'uirl amount. ol energy may he applied to the pol t'or iguifrkly heat? lne the whole inaes olA wam'. to the proper i-oneinlene'ip and thru. hy changing the ewitvh, the heat may he uniiutaiued thereafter al, normal running temperature To thie end the pot aho in prel'erahly eniall in size. and the heut roulrul is seeured hy applyhin the 'irinilinge` direetli' in proper distrihulion oirr the walls o't the pot.

'the further ronrtruetionai details of our invention will appear tutti' treni the lo|- lowing' desi-ripiiou, taken with ret'eieuee to the aeroiupan i'ing dra wings.

ln the dran'inge. Figure .l repiwents in rertieal Seel ion a eutlieient portion ot' a (looih .rear stiteher. haringr our u'nx pol, applied thereto. lo enahle the Saule to he fully apprehended: Vig, 2 ie a top plan View of the pot `eparate i'roin the reet. of the machine; Fig. fl a View in eleva tion lookingrtoward the lett oi Figs. l and Q; and Fig. fl, is an enlarged ventral vertical Sectional View of the pot, similar to Fig. l.

A euitahle pedestal t Carries the sewingr machine head 2, only a portion of which is herein Shown. The thread il is drawn from a Spool or other souree ol eupply (not shown) and posees down tln'f'iunh a guiding loop and thread eye 5 through the top o'l the electrically heated wax poty 7 into the tluid wax. and about a I:guide wall S lixedly mounted on supporte l) in the bottoni ol the pot, and thence out, to the lop guide and stri pper l0 and over a guide pulley ll. through the heated pedestal l to the various directing' derives; l2. '19. i4. l5, 1G, 17, nfl flflflll to the needle 1S andy other Stitchforrninir meehanieu'i which Serve to een' the weltv 19 to thesole Q0 ol the hoot or shoe S21 as indieated in dotted linea Fin'. l. ',lhe pot 7 ie out away or redueed in Size throughout the greater portion ot ite length, up and down` and provided with elw-.trie resiStaneo or heating' wire Q2 einliedded in fused porcelain or other suitahle insulator 23 which serves to hold the wire 2Q in direct heating engagement with the adjacent. wall of the pedestal 1.

pot, so that the lower part of the pot which contains the metal wax as indicated at- 24 ig maintained highly heated. An insulating jacket or case 25 surrounds and protects the heater. The resistance wire 22 is wound for properly distributing the required amounts of' heat in connection with binding posts 26, Q7, Q8 controlled by a switch 29 at one side of the pot. Secured to a top flange of the pot at we provide an inclined met-al 'shelf SP1 of suitable' form and size to receive the required amount of wax 32 to be melted for replenishing the pot. This shelf, being attached to the top of the pot, receives sufficient heatvby conduction from the latterto melt the wax at the required rate for the satisfactory automatic renewing of the supply at as it is used by the passage of ythe thread. To promote the `heat conduction, the flange 30 is made relatively large in mass and the shelf is also given av correspondingly large mass of metal at S3 in contact with said flange. The shelf 3l has opposite flanges or sides 34 and a front stopwall 35 and is provided at its lowest part with a restricted opening 86 best shown in Fig. 2, which permits the wax to feed slowly to .the ot according to the requirements of the machine. At its opposite side the pot, is provided with a relatively-heavy securing flange 37 having an opening 38 for a bolt 39 by which itis conveniently secured to the In use, the switch 29 is turned. to its hightemperature position so as to throw in all the windings 22\at"ig\the time the machine proper is to be -startedin the morning, and

thereby the wax in thelower part of the p'ot is quickly melted, whereupon the switch is turned to its medium-temperature position or low-temperature position, according to the work that the machine is to be operated upon or the other requirements of the special operator, and thereby the waX is thereafter maintained in the required highly fluid condition, while the conductively heated wax supply at the top of the pot is so moderately heated that it is melted relatively yslowly and caused to drip more or less continuously from the supply orifice 36. The thread. is passed through the wax downwardly and then upwardly about the directing wall 8,

and then through the top guide post l0 and over the Various pulleys, tension devices, and other parts ofthe sewing machine to the stitching mechanism at the work 19-21.

The pot is preferably composed ofcast iron or other metal, and the heater isi-.applied thereto through -the medium of a suitable insulating material directly to the walls of the pot. Said medium is preferably vitreous enamel fused directly on the walls of the pot. l

A further feature of our invention is the pmjecting shelf or flange preferably inclined at such an angle as to cause the wax as it melts to run or slide downwardly toward the pot and drip thereinto, said shelf or iange'havin means for preventing the unmelted wax from slipping into the pot. By our arrangement, the heat supply is dise tributed over the sidewalls of the pot so that, during the period of operation, uniformity oftemperature of the waX is secured, this being ,of importance in connection with using wc Xed thread.

. `Our apparatus saves the operator the trouble of constantly watching the pot, as, when once' properly heated, it maintains itself in approximately correct running condition thereafter without care, the'low-ternperature position of the switch insuringa normal heat which is ordinarily exactly what is wanted for the usual thread and rapidity of work, and the automatic re plenishing means insuring an ample supply without an excessive supply and prevent-ing the pot running empty.

A feature of .material importance is the construct-ion of the pot 7 of considera-ble depth, closed at the top except for the wax inlet and having the thread guided vertif cally therefrom to a support some distance without the pot. Owing to these matters of construction the heated air in the interior I of the pot can only find outlet by passing in contact with the unmelted wax, thereby facilitating the melting thereof. As the thread is drawn vertically from the body of melted wax up through the confined heated air in the top of the pot, the wax remaining melted during the passage through such confined heated .air will more evenly impregnate and coat the thread than would be the case were the pot open or the delivery of the threadtherefrom oblique or horizontal. Also as the supporting guide pulley 1l is some little distance without the pot, the wax on the thread has opportunity to rhecome cooled before engagement therewith.

ly our invention great economy of valuable space is effected in the sewing machine, temperature control is accomplished most effectively, and, as already pointed out, the lower portion of the pot is maintained highly heated `while the upper part preserves low temperature. The apparatus has a high ldegree of efficiency due to its small construction and t-he direct conduction of heat through the heater to the wax, having interposed only the metal and' t e insulation. The ease of replenishi'ng the wax supply is a further advantage, and this is accomplished with a small expenditure of heat, the partially melted wax moving down by gravity to a warmer partof the iron and dripping into the heated wax. This whole feature haltes it practicable to replenish the wax satisfactorily in a small vessel such as 1 our waxpot; without this feature either the 130 pot would have to be large or the Wax would have to be melted at some other point and brought in a melted state to the machine, but

the contained wax to be heated, less time and current are required. o

Having describedour invention, ywhat we claim as new and desire to secure by Letters' Patent is, Y.

1. In a shoe machine, the combination with vsewing means for operating upon a shoe with waxed thread, of means for delivei'iiig melted Wax to the thread, comprising -a wax pot provided with a closed top, an

inclined wax-holder 'having a small waxinlet opening through said top, the latter also having a vertical thread opening very slightly larger than the thread, a thread support-infr guide vertically' above the thread I h n u l y opening in 'position to maintain the thread in'a vertical position exactly centered in said thread opening so that the thread will be out of Contact with the walls of the thread opening, and means for heating said pot,

whereby the heated air from the pot can only pass out through said small wax-inlet opening to keep the wax melted at that point and out through the small thread-opening thereby operating to strip the surplus Wax un'- formly from the thread by said heat action as distinguished from mechanical action.

2.1n a shoe mach-ine. the combination with sewing means for roperating upon a.`

shoe with waxed thread, andmeans for delivering melted wax to lsaid thread,.l of a .i'vawpot havingheat-transmitting Walls, anI

electric sectional heater and switch for controlling said sectionalheatei constructed toV apply heat directly to the walls of said pot and to deliver a larger amount of current to the bottom of the pot than elsewhere, whereby the wax may be quickly melted by a high heat at the beginning of operating the machine ,and thereafter maintained uniformly wai-ined by a low heat. l

In 'testimony ivhcrcof,\ve have signed our naines to thisv specification, in the presence oi two subscribing witnesses.

,EDWIN N. CHANDLER. THEODORE B. LEWIS.

Witnesses Emmnii'iir M. CoNLiN, Dona A. Piioc'ron. 

